"Phillies and Orioles have had very preliminary talks on a trade that would send A.J. Burnett to Baltimore, sources tell @FOXSports1," he tweeted Saturday, adding that there has been "no substantial progress made yet."

The Orioles entered Saturday with a four-game lead in the American League East but are looking to add a starting pitcher. They have the ninth-worst ERA among starters (4.07) in the majors.

Burnett's wife is a Maryland native, and the couple lives there in the offseason. The right-hander has been linked to the Orioles in the past.

The 37-year-old is 6-9 with a 4.08 ERA in 21 starts and 136 2/3 innings for the Phillies this season.